abstract |
The subject matter of the invention is a process for the preparation of carboxylic acids and derivatives of them of the general formula ##STR1## wherein R means hydrogen, or a C 1-4 alkyl or a (C 1-5 alkoxy)carbonyl group, n R 1 is as defined in claim 1, n R 7 stands for hydrogen or a C 1-7 alkyl group and n R 8 means hydrogen or a carboxyl group. |